Malicious PDF — malware analysis report

Static analysis result for SHA-256 305efbc8d4cf4827…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 17:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60edec3d126be33ba9186a9b6ff6ecde SHA-1: d46181b94f24aa3fa9cb6a5792ce223850e0b83a SHA-256: 305efbc8d4cf48279d25cb90b8c9096e6f0ffa4e953fe33a525cca22fa5fa88f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to various domains, suggesting it's used to redirect users to potentially harmful content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may instruct users to open a password-protected archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=aluminium+phosphide+poisoning+pdf PDF link annotation
    • http://jar-ted.pl/file/2806645534.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/gavosixorimalizulivofexim.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/e3a998b0b50840a5fc85850b2714aa32/puzunifopedenopi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/25769463460.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/358278ff1f8dcb934303cbc236b45837/rexolesemafozorugiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161097b54cd92f---zemozetefewu.pdfIn PDF document text
    • http://podarox.ru/public/files/dudasovoxiguv.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/91545865339.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/51298652105.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea3af2629---7175751121.pdfIn PDF document text
    • http://chromavials.com/d/files/54168756125.pdfIn PDF document text
    • https://wineart.online/userfiles/file/wapitavese.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/37540352197.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c32b73b8---gopipojesanaz.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/viledovapub.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16283441592268.pdfIn PDF document text
    • https://soechi.com/userfiles/file/80538024835.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/potatunesimib.pdfIn PDF document text
    • https://tl-systems.hu/files/files/jizemoxutixa.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/e45ac1ab4b80b819b8a480dffed475b5/gozorizikaki.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074089c65170---xawonomamumarerewasu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611be717d78f2---37447068517.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/gositu.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rokifusebuwivepakij.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d9292cef629eba6a6449d32f385c3e19/19607148553.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 19540 bytes
SHA-256: dd8a85416e740e630c1ca6374d9bc102c97b6222dbc0fe0f135ed63612162dd0
font_02_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 10668 bytes
SHA-256: 8bc3500cd23eb91e24679087294b16ad59e8b652db9e8d223f62a9b3b8de167b

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